Installed on St Peter's Hill, Grantham, it marks the service of the RAF Regiment since it formed in 1942.
Former RAF Regiment serviceman Cllr Dean Ward, who represents Grantham Arnoldfield, supplemented his £1,000 Ward Member Grant with £250 of his own money to make the project happen.
He said: "I wanted something that would last. The bench is powder-coated and should last 100 years."
It was dedicated by an RAF padre, in the presence of standard bearers from around the county, and the Station Commander from RAF Honington, Grp Cpt Dave Tait, on Sunday 20 May.
The RAF Regiment was established by Royal Warrant and its first home was at Belton Woods. It moved to RAF Catterick, North Yorkshire, and now has its home in RAF Honington in Suffolk.
The regiment plays an army-style infantry role guarding key installations and air bases, and the personnel wear green rather than RAF blue.
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